Frostweave Cloth is an item that is always in demand. Tailors need it for power leveling (and many prefer to buy it rather than farm it). Not only that, but the bags are still extremely popular and sell extremely well around the 175g-275g (more or less) price range. I have even seen on one of my servers the price of these bags being equal to the price of the larger Embersilk bags (because Embersilk is so prevalent in our markets at the moment and easy to farm). Many people believe runs through Utgarde Keep to be the place for farming Frostweave Cloth, but I have discovered another place that not only is easier to farm, but more plentiful with the Frostweave drops. So get your tailor and head on over to Icecrown.
That's right, Icecrown. Specifically the Northwestern field (highlighted with a pretty pink circle around it). The Northeastern field in Icecrown is filled with ghouls that don't drop anything (with the exception of the Foot Soldiers and Stitched Brutes near the gates, but I haven't found farming them to be as profitable). The same goes for the Southeast and Southwest portions. The mobs are few and spread out so farming the Frostweave here is not a good option.
Northwestern field, however, once you get past the Skeletal Reavers and Vargul Wanderers you will find a vast plain filled with Frostweave-dropping mobs in groups of 6-8. The mob you will be farming are the Converted Heroes. Typically, you will also pull the Scourge Banner-Bearers, but they go down easily and drop the Frostweave Cloth as well. As a priest, I typically Holy Nova them to death. I put it on 1, run in, spam 1, collect oodles of Frostweave Cloth. In an hour I can typically pull in 7-10 stack depending on how much I slack between mobs (I do a fair bit of slacking) and the random drop rate. You can farm Frostweave here if you are not a tailor as well, but with a high level tailor, you have Northern Cloth Scavenging which gives you more bang for your buck.
“So why is this location better farming than Utgarde Keep?” You might be asking. For starters, none of the mobs are elite. They melt like butter, even when you're killing them as a Holy Priest. Second, you don't need to run back through an empty instance and reset it to obtain more mobs to harvest. The spawn rate of the Converted Heroes is very quick and by the time you work your way to one end of the field, you are able to trek back down killing more Converted Heroes on your way. This is also great if you have competition in the area because the re-spawn rate can handle 2-4 farmers. Third, you can fly here. We all know flying is faster than walking. Mount up, fly directly down into a group of Converted Heroes, kill, collect, mount up. Lastly, there are no mobs in this area to fight through that don't drop Frostweave cloth, which means less wasted time for you!
So...why are you still reading this,? Put on some great music (or a show!) and get to Frostweave Farming!